Three-Dimensional Tracking of Interfacial Hopping Diffusion
Journal Article
·
· Physical Review Letters
- Chinese Academy of Sciences (CAS), Changchun (China). State Key Lab. of Polymer Physics and Chemistry. Changchun Inst. of Applied Chemistry; Univ. of Colorado, Boulder, CO (United States). Dept. of Chemical and Biological Engineering; DOE/OSTI
- Univ. of Colorado, Boulder, CO (United States). Dept. of Chemical and Biological Engineering
Theoretical predictions have suggested that molecular motion at interfaces—which influences processes including heterogeneous catalysis, (bio)chemical sensing, lubrication and adhesion, and nanomaterial self-assembly—may be dominated by hypothetical “hops” through the adjacent liquid phase, where a diffusing molecule readsorbs after a given hop according to a probabilistic “sticking coefficient.” Here, we use three-dimensional (3D) single-molecule tracking to explicitly visualize this process for human serum albumin at solid-liquid interfaces that exert varying electrostatic interactions on the biomacromolecule. Following desorption from the interface, a molecule experiences multiple unproductive surface encounters before readsorption. An average of approximately seven surface collisions is required for the repulsive surfaces, decreasing to approximately two and a half for surfaces that are more attractive. The hops themselves are also influenced by long-range interactions, with increased electrostatic repulsion causing hops of longer duration and distance. These findings explicitly demonstrate that interfacial diffusion is dominated by biased 3D Brownian motion involving bulk-surface coupling and that it can be controlled by influencing short- and long-range adsorbate-surface interactions.
- Research Organization:
- Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0001854
- OSTI ID:
- 1541263
- Alternate ID(s):
- OSTI ID: 1416445
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 26 Vol. 119; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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